<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>细节点</title>
  <script src="vue.js"></script>
</head>
<body>
<!--ref是一个引用-->

<div id="app">
     <counter ref="one" @change="handleChange"></counter>
     <counter ref="two" @change="handleChange"></counter>
     <div>{{total}}</div>
</div>
<script>
  Vue.component('counter',{
      template:'<div @click="handleClick">{{number}}</div>',
      data:function(){
          return{
             number:0
          }
      },
      methods:{
          handleClick:function(){
             this.number ++
             this.$emit('change')
          }
      }
  })
  var vm=new Vue({
     el:"#app",
     data:{
      total:0
     },
     methods:{
      handleChange:function(){
             console.log(this.$refs.one.number)
             console.log(this.$refs.two.number)
        this.total=this.$refs.one.number+this.$refs.two.number
       }
    }
  })
</script>
</body>
</html>
